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LS3 Wire Harness Connectors

I bought a cruise and connect package from GM and there are some connectors im not familiar with for my LS swap Chevelle.

ENGINE HARNESS:
1. What is the VEH SPD vehicle speed connector used for on LS swap. I plan on using gps speedometer. Does the PCM need this for anything?

2. GEN connector is only one 16 gauge wire that seems to plug into the alternator. The alternator has 4 pins but the connector only has one wire. The alternator has a single connection on the back that I assume will be for the main harness in the car and for starter solenoid and battery charging.

3. I have an EOP connector that I assume is for engine oil pressure. Is this actually needed. I will have aftermarket gauges with one for oil pressure. My understanding is if the sensor does not detect oil pressure it will not allow the fuel pump to run??? Is this actually needed or has this been deleted in the programming

TRANSMISSION:
Looking at the photos, are any of these wires actually needed. I have a 4L75E electronic tranny.